Combination square



Sept.A 1s, 1924. 1,508,423 J. Ol-THOMAS v COMBINATION SQUARE' Filed .July 27 -1921 Patented Sept. 16, 1924.

UNITED STATES JOHN 0. THOMAS, QF LONG BEACH, CALIFORNIA.

COMBINATION SQUARE.

Application filed Ju1y27, 1321. Serial No. 488,010...

and State of Claflifornia, have invented certain new and useful Improvements in Combination Squares, of which the following is a specification.

The present invention relates to combinatio-n squares such as are generally used by carpenters, tool makers and machinists. My improvement in this kind of squares has now for its object to facilitate the laying out of squares and lengths and also for plotting bevels or angles of any size. This implement may alsol be advantageously used as an ordinary gage or butt gage.

One embodiment of the invention is illustrated in the accompanying drawing, in which- Figure l shows a plan view of the combination square folded;

Figure 2 is a similar view with its adjusting leaf in working position;

' Figure 3 is a top plan view of Figure 2.

A straight edge or blade 10 is securely fastened to the handle or beam 11 by means of rivets 12 to form a square. 0n the outer edge of the blade, suitable graduations 13 are provided. As will be seen in the figures, the outer edge of the blade 10 projects slightly beyond the end of the handle or beam 11 so that the reading of the graduation will not be interferred with.

The handle 11 may be made of two solid blocks spaced apart to form a narrow opening between them and the blade 10 riveted as at 12 to the end portion of the handle between said blocks. The handle 11 may alsolbe made in two parts riveted together at the outer end of the handle at 14 with spacing blocks 15 inserted between them. A space is thus provided for the leaf 16 for sliding in and out, and an end opening is provided between the spacing blocks 14 to hold the leafA 16 in housing position.l

The straight edged leaf 16 is provided with a longitudinal slot 17 and it has a gaduation 18 along both of yits longest e ges. vided a permanent gage point or scratching point 19 with which it is possible to mark the side lengths of the work piece.

A clamping'v bolt 20 is provided at the inner end ofthe handle 11 and thisbolt engages in the longitudinal slot 17 of the At one end of the leaf 16 is pro` sliding leaf 16. For the purpose of tightening the leaf in any desired position, the

clamping handle or wing nut 21 for the bolt 20 is provided on the upper side of the handle 11.

Figure 1 shows the implement folded as has been described and it is only necessary to loosen the wingl nut 21 to swing the' leaf 16 for the purpose of setting it at an angle, as shown in lfull lines in Figure 2, vfor-laying off a certain angle yafter the wing nut has again been tightened to hold the leaf rigidly in that position. Asthe leaf v16 may be turned completely around, it will be readily understood that any angle may be laid 0H' with this implement.

The sliding leaf `16 may also be used as an' extension, as indicated in dotted linesA inf Figure 2, when it will form a straight edge with the blade 10; as the position of the clamping screw with regard to the edge of i the blade 10 is so selected that a longitudinal edge of the leaf 16 will coincide with the outer edge of the blade 10 when placed T soA blocks between said members respectively at f the corners of one end thereof, and means permanently securing said lmembers and blocks together, said blocks being spaced to define an open passage between them, a straight-edged blade inserted between said members-at the other end of the beam and rigidly attached to one of said members at a right angle thereto while spaced from the other member, a strlaight-edged leaf disposed between said blade and the other member and having a longitudinal slot and adapted to be housed within lthe beam'with one end extending through said passage or disposed in angular relation to the beam and the blade, a clamping screwk passing through kthe beam and the'blade at said other end and through the slot in the leaf, and a nut on] said screw adapted to be turned home against the other member of the beam to secure the leaf in a. set position relative to the beam and the blade.

In testimony whereof I affix my signa- 

